US9784210B2 - Piston for an internal combustion engine - Google Patents

Piston for an internal combustion engine Download PDF

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Publication number
US9784210B2
US9784210B2 US14/646,800 US201314646800A US9784210B2 US 9784210 B2 US9784210 B2 US 9784210B2 US 201314646800 A US201314646800 A US 201314646800A US 9784210 B2 US9784210 B2 US 9784210B2
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US
United States
Prior art keywords
pin
piston
pin bore
turned
axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
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US14/646,800
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English (en)
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US20150308370A1 (en
Inventor
Wolfgang Issler
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Mahle International GmbH
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Mahle International GmbH
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Assigned to MAHLE INTERNATIONAL GMBH reassignment MAHLE INTERNATIONAL GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISSLER, WOLFGANG
Publication of US20150308370A1 publication Critical patent/US20150308370A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/10—Connection to driving members
    • F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
    • F16J1/16—Connection to driving members with connecting-rods, i.e. pivotal connections with gudgeon-pin; Gudgeon-pins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 

Definitions

  • the invention relates to a piston for an internal combustion engine, having a piston crown, followed radially on the outside, in the direction facing away from the piston crown, by a ring belt, having two pin bosses formed onto the piston crown in the direction facing away from the piston crown, which lie opposite one another and each have a pin bore, and having a piston skirt that connects the pin bosses with one another.
  • a piston of the type stated initially is known from the Japanese application JP 62184274 A.
  • the known piston has pin bores in which turned grooves are formed, which run radially on the inside over the entire circumference of the inside surface of the pin bores.
  • the result achieved in this way is that in the case of deformation of the piston pin under a load, the contact region between the piston pin and the radially inner edges of the pin bores is increased in size, so that as a result, the risk that the piston pin and the piston are damaged in the region of the radially inner edges of the pin bores is reduced.
  • This task is accomplished in that a turned groove is formed in each of the radially inner regions of the lower halves of the pin bores, facing away from the piston crown.
  • the zenith of the pin bore remains free of a turned groove, so that the entire zenith of the pin bore stands in contact with the piston pin, so that as a result, the pressure per contact surface is also reduced during the compression and working cycle, leading to a reduction in wear of both the piston pin and of the pin bore.
  • FIG. 1 one half of a piston, in section along the piston axis and along the pin bore axis, with a first embodiment of a turned groove;
  • FIG. 2 one half of the piston in section along a plane that lies on the piston axis and stands perpendicular to the pin bore axis, and
  • FIG. 3 an enlargement of the detail “A” from FIG. 1 , with a second embodiment of the turned groove.
  • FIG. 1 shows one half of a piston 1 for an internal combustion engine, in section along a plane that is spanned by the piston axis 2 and the pin bore axis 3 .
  • the piston 1 has a piston crown 4 , a top land 5 that follows it radially on the outside, and a ring belt 6 that follows the top land 5 in the direction facing away from the piston crown.
  • the piston 1 has pin bosses 7 that follow the ring belt 6 in the direction facing away from the piston crown, each having a pin bore 8 .
  • the pin securing groove 9 that is disposed in the radially outer region of the pin bore 8 can also be seen.
  • a turned groove 10 is formed, which reaches radially on the inside all the way to the face side 11 of the pin boss 7 , and which is disposed in the lower half of the pin bore 8 .
  • the turned grooves 10 are configured in circular-cylindrical manner, with a cylinder axis 15 that lies parallel to the pin bore axis 3 , and have the shape of a stair step in section.
  • FIG. 2 shows one half of the piston in section along a plane that lies on the piston axis 2 and stands perpendicular to the pin bore axis 3 .
  • the piston skirt 12 , the pin bore 8 , and the turned groove 10 disposed in the lower region of the pin bore 8 can be seen.
  • the turned groove 10 can have a length “L” between 0.5 mm and 3 mm and a depth “T” between 0.05 mm and 0.3 mm.
  • FIG. 3 shows an enlarged detail “A” from FIG. 1 , which shows a second embodiment of the turned groove 10 ′.
  • This groove has a radially inner region 13 that reaches all the way to the radially inner face side 11 of the pin boss 7 , is circular-cylindrical, and lies parallel to the pin bore axis 3 with its cylinder axis, and a radially outer region 14 configured conically, the conicity of which opens up radially inward.
  • the piston 1 can consist of aluminum, cast iron or steel, and can be produced by means of casting or forging.
  • the turned groove 10 , 10 ′ is produced by means of a lathe, in which the axis of the lathe tool is displaceable. In the production of the turned groove 10 , 10 ′, the axis of the lathe tool is at first identical with the pin bore axis 3 , and is then moved downward by the distance “T” over the course of forming of the turned groove 10 , 10 ′, in the direction facing away from the piston crown.
  • the turned groove 10 , 10 ′ can be introduced using a second lathe tool, before and after machining of the pin bore 8 using a first lathe tool; this second tool is rotated about an axis that lies parallel to the pin bore axis 3 and has the distance “T” from the pin bore axis 3 .
  • the piston 1 is pulled downward by the connecting rod, by way of the piston pin, wherein such a force is exerted by the connection rod, on the piston pin, at higher speeds of rotation, that the piston pin bends downward.
  • the piston pin comes into contact with the inner, lower edge of the pin bore 8 , leading to damage of the piston pin and to cracks in the piston material close to the inner, lower edge of the pin bore 8 .
  • the pin bore 8 has a turned groove 10 , 10 ′ in its inner, lower region, according to the present invention, the inner part of the bending piston pin lies on two edges at the beginning of the intake cycle, on which edges the pressure stress exerted by the piston pin on the inner, lower region of the pin bore 8 is distributed, so that as a result, the risk that the piston pin and the piston will be damaged in the region of the inner, lower edge of the pin bore is greatly reduced.
  • the turned groove 10 , 10 ′ offers the advantage that access of the oil to the pin bore 8 is facilitated by way of the turned groove, so that as a result, lubrication of the piston pin is improved.
  • a further advantage of the invention results from the fact that great pressure is exerted on the upper part of the piston pin during the compression and working cycle, by way of the zenith of the pin bore.
  • this pressure per surface area as much as possible and to thereby reduce the wear of the piston pin and of the pin bore in the zenith region as much as possible
  • the contact surface between the zenith of the pin bore and the upper part of the piston pin should be as great as possible.
  • the turned groove 10 , 10 ′ is situated in the lower half of the pin bore 8 , so that the entire zenith surface of the in bore can enter into contact with the piston pin, and thereby minimal wear of the zenith of the pin bore 8 and of the upper part of the piston pin occurs.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US14/646,800 2012-11-23 2013-11-22 Piston for an internal combustion engine Expired - Fee Related US9784210B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102012022913.5A DE102012022913A1 (de) 2012-11-23 2012-11-23 Kolben für einen Verbrennungsmotor
DE102012022913.5 2012-11-23
DE102012022913 2012-11-23
PCT/DE2013/000688 WO2014079406A1 (de) 2012-11-23 2013-11-22 Kolben für einen verbrennungsmotor

Publications (2)

Publication Number Publication Date
US20150308370A1 US20150308370A1 (en) 2015-10-29
US9784210B2 true US9784210B2 (en) 2017-10-10

Family

ID=49882728

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/646,800 Expired - Fee Related US9784210B2 (en) 2012-11-23 2013-11-22 Piston for an internal combustion engine

Country Status (7)

Country Link
US (1) US9784210B2 (enrdf_load_stackoverflow)
EP (1) EP2923122B1 (enrdf_load_stackoverflow)
JP (1) JP6238999B2 (enrdf_load_stackoverflow)
CN (1) CN104813080B (enrdf_load_stackoverflow)
BR (1) BR112015011865A2 (enrdf_load_stackoverflow)
DE (1) DE102012022913A1 (enrdf_load_stackoverflow)
WO (1) WO2014079406A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10774931B2 (en) 2015-10-19 2020-09-15 Mahle International Gmbh Piston

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2828402A1 (de) 1978-06-28 1980-02-07 Alcan Aluminiumwerke Kolben, insbesondere fuer brennkraftmaschinen
US4359973A (en) * 1979-08-09 1982-11-23 Honda Giken Kogyo Kabushiki Kaisha Oiling system for piston of internal combustion engine
JPS5997362A (ja) 1982-11-22 1984-06-05 Toyota Motor Corp ピストンピンおよびその製造方法
JPS62184274A (ja) 1986-02-07 1987-08-12 Izumi Jidosha Kogyo Kk 内燃機関用ピストン
DE3609019C1 (en) 1986-03-18 1987-09-10 Mahle Gmbh Method for the production of the hub hole of a trunk piston, particularly for internal combustion engines
US5112145A (en) * 1990-01-18 1992-05-12 Detroit Diesel Corporation Piston and bearing assemblies
DE4327772A1 (de) 1993-08-18 1995-02-23 Mahle Gmbh Leichtmetallkolben für hochbelastete Verbrennungsmotoren
JPH09229192A (ja) 1996-02-27 1997-09-02 Hino Motors Ltd 銅合金ブッシュ一体ピストン
US5746169A (en) 1994-09-08 1998-05-05 Mahle Gmbh Light-metal piston for highly stressed internal combustion engines
JPH11303993A (ja) 1998-04-17 1999-11-02 Yamaha Motor Co Ltd 内燃機関用ピストン
US20070204746A1 (en) * 2004-02-18 2007-09-06 Wolfgang Issler Piston Pin Bearing For Pistons Of An Internal Combustion Engine
US8011287B2 (en) * 2006-04-04 2011-09-06 Mahle International Gmbh Pin bosses of a piston for an internal combustion engine
DE102011103105A1 (de) 2011-05-25 2012-11-29 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zur Herstellung des Kolbens

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07232237A (ja) * 1994-02-25 1995-09-05 Unisia Jecs Corp ピストン用金型
JP3548451B2 (ja) * 1999-02-22 2004-07-28 本田技研工業株式会社 ピストンのピン孔構造
DE10231233A1 (de) * 2002-07-11 2004-02-05 Mahle Gmbh Kolben für einen Verbrennungsmotor
DE10255731A1 (de) * 2002-11-29 2004-06-09 Mahle Gmbh Kolben für einen Verbrennungsmotor
JP4301225B2 (ja) * 2005-09-08 2009-07-22 三菱自動車工業株式会社 内燃機関のピストン
DE102012203744A1 (de) * 2012-03-09 2013-09-12 Mahle International Gmbh Kolbenbolzen

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2828402A1 (de) 1978-06-28 1980-02-07 Alcan Aluminiumwerke Kolben, insbesondere fuer brennkraftmaschinen
US4291614A (en) 1978-06-28 1981-09-29 Alcan Aluminiumwerk Nurnberg Gmbh Piston and process for its manufacture
US4359973A (en) * 1979-08-09 1982-11-23 Honda Giken Kogyo Kabushiki Kaisha Oiling system for piston of internal combustion engine
JPS5997362A (ja) 1982-11-22 1984-06-05 Toyota Motor Corp ピストンピンおよびその製造方法
JPS62184274A (ja) 1986-02-07 1987-08-12 Izumi Jidosha Kogyo Kk 内燃機関用ピストン
DE3609019C1 (en) 1986-03-18 1987-09-10 Mahle Gmbh Method for the production of the hub hole of a trunk piston, particularly for internal combustion engines
US5112145A (en) * 1990-01-18 1992-05-12 Detroit Diesel Corporation Piston and bearing assemblies
DE4431990A1 (de) 1993-08-18 1996-03-14 Mahle Gmbh Leichtmetallkolben für hochbelastete Verbrennungsmotoren
DE4327772A1 (de) 1993-08-18 1995-02-23 Mahle Gmbh Leichtmetallkolben für hochbelastete Verbrennungsmotoren
US5653156A (en) * 1993-08-18 1997-08-05 Mahle Gmbh Light metal piston for highly stresses internal combustion engines
US5746169A (en) 1994-09-08 1998-05-05 Mahle Gmbh Light-metal piston for highly stressed internal combustion engines
JPH09229192A (ja) 1996-02-27 1997-09-02 Hino Motors Ltd 銅合金ブッシュ一体ピストン
JPH11303993A (ja) 1998-04-17 1999-11-02 Yamaha Motor Co Ltd 内燃機関用ピストン
US20070204746A1 (en) * 2004-02-18 2007-09-06 Wolfgang Issler Piston Pin Bearing For Pistons Of An Internal Combustion Engine
US8011287B2 (en) * 2006-04-04 2011-09-06 Mahle International Gmbh Pin bosses of a piston for an internal combustion engine
DE102011103105A1 (de) 2011-05-25 2012-11-29 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zur Herstellung des Kolbens
US20140150747A1 (en) 2011-05-25 2014-06-05 Mahle International Gmbh Piston for an internal combustion engine and method for producing the piston

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
International Search Report of PCT/DE2013/000688, dated Apr. 4, 2014.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10774931B2 (en) 2015-10-19 2020-09-15 Mahle International Gmbh Piston

Also Published As

Publication number Publication date
EP2923122B1 (de) 2018-10-17
DE102012022913A1 (de) 2014-05-28
EP2923122A1 (de) 2015-09-30
BR112015011865A2 (pt) 2017-07-11
JP6238999B2 (ja) 2017-11-29
CN104813080B (zh) 2017-10-20
CN104813080A (zh) 2015-07-29
WO2014079406A1 (de) 2014-05-30
JP2016501335A (ja) 2016-01-18
US20150308370A1 (en) 2015-10-29

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